README.md in json_api_client-1.0.0.beta6 vs README.md in json_api_client-1.0.0.beta7

@@ -309,9 +309,11 @@
 * `:time` - *Note: Include the time zone in the string if it's different than local time.
 * `:boolean` - *Note: we will cast the string version of "true" and "false" to their respective values*
 
 Also, we consider `nil` to be an acceptable value and will not cast the value.
 
+Note : Do not map the primary key as int.
+
 ## Customizing
 
 ### Paths
 
 You can customize this path by changing your resource's `table_name`: